Hostname: page-component-7479d7b7d-rvbq7 Total loading time: 0 Render date: 2024-07-09T09:26:01.501Z Has data issue: false hasContentIssue false
  • English
  • Français

A frequency response of the dairy cow's teat

Published online by Cambridge University Press:  01 June 2009

Sybren Y. Reitsma  and
Norman R. Scott
Sybren Y. Reitsma
Affiliation:
Agricultural Engineering Department, Cornell University, Ithaca, N.Y. 14853, USA
Norman R. Scott
Affiliation:
Agricultural Engineering Department, Cornell University, Ithaca, N.Y. 14853, USA
Get access Rights & Permissions [Opens in a new window]

Summary

A frequency response of the cow's teat has been determined by applying sinusoidal changes in vacuum level to the teat. Twelve frequencies were applied ranging from 0.06 to 12 Hz. The responses investigated were the external teat end diameter and the teat milk flow-rate. The measured variables were: (1) frequency of applied pressure and teat end diameter, (2) peak-to-peak pressure and teat end diameter, (3) average vacuum level and teat end diameter, (4) time delay between maxima of vacuum level and teat end diameter, (5) time delay between minima of vacuum level and teat end diameter, and (6) teat milk flow-rate. The results showed that within the range of the investigation milk flow-rates were lower between 0.8 and 2.5 Hz than at frequencies both below and above this range. A statistical analysis of the flow rate and teat end diameter data supports the common practice of applying the same frequency to both front and rear teats during milking. Other findings show good agreement with results reported previously on dynamic responses of the teat to step changes in pressure.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 27 - 33
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Clough, P. A. & Dodd, F. H. (1957). Report, National Institute for Research in Dairying, 1956, p. 27.Google Scholar
Jorgensen, K. E. & Caruolo, E. V. (1963). Journal of Dairy Science 46, 624.CrossRefGoogle Scholar
Letham, D. L. (1967). Machine Design 39, 142.Google Scholar
Milsum, J. H. (1966). Biological Control Systems Analysis. New York: McGraw-Hill.Google Scholar
Phelan, R. M. (1962). Fundamentals of Mechanical Design, 2nd edn.New York: McGraw-Hill.Google Scholar
Reitsma, S. Y. (1977). Thesis, Cornell University.Google Scholar
Reitsma, S. Y. & Scott, N. R. (1979). Journal of Dairy Research 46, 15.CrossRefGoogle Scholar
Schmidt, G. H., Guthrie, R. S., Guest, R. W., Hundtoft, E. B., Kumar, A. & Henderson, C. R. (1963). Effect of changes in milking machine design on milking rates, machine stripping, and mastitis. Bulletin Cornell University Agricultural Experimental Station, no. 983.Google Scholar
Stewart, W. E. & Schultz, L. H. (1958). Journal of Dairy Science 41, 849.CrossRefGoogle Scholar
Thiel, C. C., Clough, P. A., Westgarth, D. R. & Akam, D. N. (1966). Journal of Dairy Research 33, 177.Google Scholar
Weber, W. (1977). Dissertation. M&ünchen, W. Germany: Technischen Universität München.Google Scholar